\section{.brn Fornat specicfications}\label{explanationsaboutbrnformat}
\subsection{format for Sul\-Ed/Sule\-X}\label{explanationsaboutbrnformat_Brain}
The brain format is paired with the \char`\"{}.brn\char`\"{} extension and is coded as follow :

The brain surface coded as an .obj mesh :\begin{itemize}
\item For each vertex, a line is written : \char`\"{}v coord\-X coord\-Y coord\-Z\char`\"{} : the 'v' letter indicates a vertex, we then have the coordinates of this vertex in the 3D space.\item For each face, a line is written : \char`\"{}f IDVert1 IDVert2 IDVert3 ...\char`\"{} : the 'f' letter indicates a face, we then have a list of the vertices ID that composes this face.\end{itemize}


The sulcis tree (only the ancesters) are coded as follow :\begin{itemize}
\item A line \char`\"{}n name\char`\"{} : the 'n' letter indicates a name followed by the name itself as a string.\item A line \char`\"{}c red green blue\char`\"{} : the 'c' letter indicates a color with its three components in a RGB format. Every component have to be between 0 and 1.\item For each vertex of the sulcus, a line \char`\"{}sv ID\char`\"{} : the 'sv' indicates a segment vertex followed by the vertex ID.\end{itemize}


Example :



\begin{Code}\begin{verbatim} v 1 1 0
 v 0.2 5 2
 v 0 2 0.3
 ...
 f 1 2 3
 f 1 100 253
 f 21 354 45
 ...
 n INSULA
 c 1 0 0
 sv 1
 sv 12
 sv 8
 ...
 n CENTRAL SULCUS
 c 0.5 1 0.5
 sv 25
 sv 458
 sv 446
 ...
\end{verbatim}\end{Code}

 